The study of the natural and physical phenomena of the universe is called physics. Physics as a field of sciences seeks to understand the measure, explain and even model all of the various fundamental forces of this universe. This field of science seeks to uncover all of the fundamental laws of the physical universe, in all of its forms. The study of gravity, matter, and energy are all under the field of physics. This would make physics one of the foundational parts of the sciences. Engineering, biology, chemistry, and many other branches of the science all rely on physics in one form or another. Without understanding the basics physical laws of the universe, it would be hard to study other branches of the sciences as well.
What is Physics?
Three Branches of Physics
The study of classic physics was first defined and discovered by Sir Isaac Newton. Newton came upon the study of physics as a way to explain natural phenomena of this universe, such as when an apple would fall from a tree to the ground. Newton also wanted to explain why planets and stellar bodies seemed to rotate around each other. It is through these different questions that Sir Isaac Newton finally conceptualized what is now known as classical physics. Newton attempted to draw up natural laws and also model the universe in more easily understood terms. In general, there are three branches of physics.
The first branch of physics is called classical physics. This is the kind of physics which applies to the various physical forces in our everyday world. For example, the world of solid, gaseous and liquid matter, is under the purview of classical physics. Engineering, such as that of roads, bridges, cars and airplanes, all operate under models and laws of classical physics. Concepts, such as time, space, energy and matter are all defined in classical physics as well. It is through the study of all of these aspects of classical physics, that humankind has advanced so much for the past few centuries.
Another branch of physics is called quantum physics. This is the physics of the small. The extremely microscopic world of molecules, fields, particles, and atoms all fall under the study of quantum physics. This kind of physics operates differently from classical physics since the rules of the physical universe do not stay the same at such a microscopic level. This branch of physics would deal with lasers, electronic diodes, and a lot of specialized equipment. Quantum physics could be thought of as an extension of classical physics because it does not challenge the definitions of space and time that are put forward by the classical physicists.
The third branch of physics is called general relativity. This branch of physics is concerned with the physical laws of the macroscopic universe. This would mean the world of the extremely big, and that would mean stellar bodies such as stars, planets, black holes, and any other large object that projects a large amount of gravity. This kind of physics is in direct contradiction to the laws of space and time that are put forward by classic physics. However, general relativity still retains the same laws of matter and energy which are put forward by classical physics.